21201203233 has 6 divisors (see below), whose sum is σ = 24662624226. Its totient is φ = 18172459872.

The previous prime is 21201203213. The next prime is 21201203329. The reversal of 21201203233 is 33230210212.

It can be written as a sum of positive squares in only one way, i.e., 11857467664 + 9343735569 = 108892^2 + 96663^2 .

It is not a de Polignac number, because 21201203233 - 2⁵ = 21201203201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21201203233.

It is not an unprimeable number, because it can be changed into a prime (21201203213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216338760 + ... + 216338857.

It is an arithmetic number, because the mean of its divisors is an integer number (4110437371).

Almost surely, 2^21201203233 is an apocalyptic number.

It is an amenable number.

21201203233 is a deficient number, since it is larger than the sum of its proper divisors (3461420993).

21201203233 is an equidigital number, since it uses as much as digits as its factorization.

21201203233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432677631 (or 432677624 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21201203233 its reverse (33230210212), we get a palindrome (54431413445).

The spelling of 21201203233 in words is "twenty-one billion, two hundred one million, two hundred three thousand, two hundred thirty-three".